@article{CM_1996__104_2_107_0,
     author = {Assi, A. and Castro-Jim\'enez, F. J. and Granger, J. M.},
     title = {How to calculate the slopes of a $D$-module},
     journal = {Compositio Mathematica},
     pages = {107--123},
     publisher = {Kluwer Academic Publishers},
     volume = {104},
     number = {2},
     year = {1996},
     mrnumber = {1421395},
     zbl = {0862.32005},
     language = {en},
     url = {http://www.numdam.org/item/CM_1996__104_2_107_0/}
}